Danny Cimoli was born in England in 1969, and raised by an Italian mother. He and his mother lived in Paris, France. Danny was an amateur magician and wanted to be in the big time. His mother, Lina Cimoli, who considered Danny's stuff toys, tried to help him get a job. After he blew off a job interview, she became frustrated with him and threw his props out the window into the street. When he went out to get his things, a truck hit Danny and killed him. A few minutes later, Danny revived as an Immortal.Danny joined the circus, becoming a big act for the show. He called himself "The Immortal Cimoli", not actually knowing he was Immortal, until he met Duncan MacLeod and Amanda, who went to the circus to see the show. Duncan and Amanda sensed the presence of another Immortal, realizing that Danny was one of them. Danny's act consisted in being shot and coming back to life. Duncan and Amanda went visit Danny after the show, realizing that he was new to The Game. They told Danny about being Immortal, who was so overwhelmed that he believed that he could become bigger than Harry Houdini.
That night at the circus, Danny sensed the presence of another Immortal, Damon Case. Case challenged Danny to fight, but Danny wasn't ready to face Case, telling him he didn't even own a sword yet. Danny fled to Duncan's barge and told him about Case. Duncan had encountered Case before when Case had killed another new immortal and student of MacLeod's.
Duncan tried to talk to Case about Danny, but Case was inflexible, immortals - no matter how young or inexperienced - were there to challenge and fight. Danny called the police to protect Duncan from losing his head.
Duncan told Danny that he needed to train in Japan, but Danny couldn't leave his mother behind. Danny told MacLeod that he was offered a show in Las Vegas.
Later, Duncan faced Case. After a duel, Duncan held tha advantage and asked the man to walk away and leave Danny be, but when Case refused, Duncan took Case's head and received his Quickening. After Case's death, Duncan visited Danny who asked Duncan to help him in a trick. Danny cuffed Duncan and pulled out a sword. Danny nearly took Duncan's head, but Duncan got free of the cuffs. Danny wanted to take Duncan's head so he would have the strength to defeat Damon Case but Duncan told Danny that he had taken care of Case.Danny felt bad for what he was about to do. Duncan came to see Danny to see if he is still going to Las Vegas, which he was. Duncan saw that Danny was mostly interested in getting his "15 minutes of fame". In Vegas, after doing his show, Danny is last seen being threatened by Immortal Vrej Ratavoussian in the building's parking lot, while he's talking to his mother on a cell phone. Sensing the other, he told his mother that he loved her.
Speculation has it that Vrej took Danny's head, rather than Danny taking Vrej's, but there is no conclusive proof one way or the other.